[PATCH 07/10] iio: adc: at91-sama5d2_adc: fix differential channels in triggered mode
From: <hidden>
Date: 2019-12-18 16:24:10
Also in:
linux-devicetree, linux-iio, linux-rtc, lkml
Subsystem:
iio subsystem and drivers, microchip sama5d2-compatible adc driver, the rest · Maintainers:
Jonathan Cameron, Eugen Hristev, Linus Torvalds
From: Eugen Hristev <redacted> The differential channels require writing the channel offset register (COR). Otherwise they do not work in differential mode. The configuration of COR is missing in triggered mode. Signed-off-by: Eugen Hristev <redacted> --- drivers/iio/adc/at91-sama5d2_adc.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index a6b4dff..ccffa48 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c@@ -900,6 +900,7 @@ static int at91_adc_buffer_postenable(struct iio_dev *indio) for_each_set_bit(bit, indio->active_scan_mask, indio->num_channels) { struct iio_chan_spec const *chan = at91_adc_chan_get(indio, bit); + u32 cor; if (!chan) continue;
@@ -908,6 +909,17 @@ static int at91_adc_buffer_postenable(struct iio_dev *indio) chan->type == IIO_PRESSURE) continue; + cor = at91_adc_readl(st, AT91_SAMA5D2_COR); + + if (chan->differential) + cor |= (BIT(chan->channel) | BIT(chan->channel2)) << + AT91_SAMA5D2_COR_DIFF_OFFSET; + else + cor &= ~(BIT(chan->channel) << + AT91_SAMA5D2_COR_DIFF_OFFSET); + + at91_adc_writel(st, AT91_SAMA5D2_COR, cor); + at91_adc_writel(st, AT91_SAMA5D2_CHER, BIT(chan->channel)); if (use_irq) { at91_adc_writel(st, AT91_SAMA5D2_IER,
--
2.7.4
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